Geoff Chappell - Software Analyst
This macro is not built in unless compiling with the /Zc:wchar_t option active and the /Yu option inactive. When it is built in, the macro is _NATIVE_WCHAR_T_DEFINED only, with no argument list.
When it is built in, the _NATIVE_WCHAR_T_DEFINED macro expands to the text for the integer constant 1 in decimal notation.